2 research outputs found
MOF-on-MOF-Derived Ultrafine Fe<sub>2</sub>P‑Co<sub>2</sub>P Heterostructures for High-Efficiency and Durable Anion Exchange Membrane Water Electrolyzers
The
alkaline hydrogen evolution reaction (HER) in an anion exchange
membrane water electrolyzer (AEMWE) is considered to be a promising
approach for large-scale industrial hydrogen production. Nevertheless,
it is severely hampered by the inability to operate tolerable HER
catalysts consistently under low overpotentials at ampere-level current
densities. Here, we develop a universal ligand-exchange (MOF-on-MOF)
modulation strategy to synthesize ultrafine Fe2P and Co2P nanoparticles, which are well anchored on N and P dual-doped
carbon porous nanosheets (Fe2P-Co2P/NPC). In
addition, benefiting from the downshift of the d-band center and the
interfacial Co-P-Fe bridging, the electron-rich P site is triggered,
which induces the redistribution of electron density and the swapping
of active centers, lowering the energy barrier of the HER. As a result,
the Fe2P-Co2P/NPC catalyst only requires a low
overpotential of 175 mV to achieve a current density of 1000 mA cm–2. The solar-driven water electrolysis system presents
a record-setting and stable solar-to-hydrogen conversion efficiency
of 20.36%. Crucially, the catalyst could stably operate at 1000 mA
cm–2 over 1000 h in a practical AEMWE at an estimated
cost of US2 per kg of H2) set by the U.S. Department of
Energy (DOE)
MOF-on-MOF-Derived Ultrafine Fe<sub>2</sub>P‑Co<sub>2</sub>P Heterostructures for High-Efficiency and Durable Anion Exchange Membrane Water Electrolyzers
The
alkaline hydrogen evolution reaction (HER) in an anion exchange
membrane water electrolyzer (AEMWE) is considered to be a promising
approach for large-scale industrial hydrogen production. Nevertheless,
it is severely hampered by the inability to operate tolerable HER
catalysts consistently under low overpotentials at ampere-level current
densities. Here, we develop a universal ligand-exchange (MOF-on-MOF)
modulation strategy to synthesize ultrafine Fe2P and Co2P nanoparticles, which are well anchored on N and P dual-doped
carbon porous nanosheets (Fe2P-Co2P/NPC). In
addition, benefiting from the downshift of the d-band center and the
interfacial Co-P-Fe bridging, the electron-rich P site is triggered,
which induces the redistribution of electron density and the swapping
of active centers, lowering the energy barrier of the HER. As a result,
the Fe2P-Co2P/NPC catalyst only requires a low
overpotential of 175 mV to achieve a current density of 1000 mA cm–2. The solar-driven water electrolysis system presents
a record-setting and stable solar-to-hydrogen conversion efficiency
of 20.36%. Crucially, the catalyst could stably operate at 1000 mA
cm–2 over 1000 h in a practical AEMWE at an estimated
cost of US2 per kg of H2) set by the U.S. Department of
Energy (DOE)